Cristina, the youngest daughter of King Juan Carlos, has been summoned to answer questions (Picture: Daniel Aguilar/Reuters)

The King of Spain’s daughter Princess Cristina has been summoned by a judge to face questions over alleged tax fraud and money laundering.

The 48-year-old, King Juan Carlos’ youngest daughter, will have to appear in court on March 8 to answer questions over Aizoon, a company she set up with her husband Iñaki Urdangarin.

The Duchess and Duke of Palma de Mallorca both deny any wrongdoing.

Ex-Olympic handball player Mr Urdangarin is under investigation for alleged corruption relating to a non-profit foundation he set up called the Nóos Institute.

Princess Cristina with her husband Inaki Urdangarin who is facing allegations of fraud (Picture: Albert Gea/Reuters)

He is alleged, alongside others including his ex-associate Diego Torres, of embezzling and redirecting €6million (£5million) in public funds to private hands.

With regards to that investigation, the Spanish court last year cancelled a subpoena against The Infanta Cristina for questioning – and Mr Urdangarin was not charged with a crime.

The allegations come as a series of embarrassments continue to strike a blow against the couple’s reputation.

In November half of their palace and various other properties they own were seized by courts and kept as bail in the ongoing investigations surrounding the alleged fraud.

In the same week private emails sent by Mr Urdangarin were published in Spanish media which showed the duke engaging in casual sexist humour and making a crude joke at the expense of his sister-in-law.